diff --git a/Project.toml b/Project.toml
index d93d3be1..4392b985 100644
--- a/Project.toml
+++ b/Project.toml
@@ -22,7 +22,6 @@ Parameters = "d96e819e-fc66-5662-9728-84c9c7592b0a"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
-ReferenceFrameRotations = "74f56ac7-18b3-5285-802d-d4bd4f104033"
 Rotations = "6038ab10-8711-5258-84ad-4b1120ba62dc"
 Serialization = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
@@ -41,7 +40,9 @@ Dierckx = "0.5"
 DiffEqBase = "6.152.2"
 DocStringExtensions = "0.8, 0.9"
 Documenter = "1.0"
+Interpolations = "0.15"
 KitePodModels = "0.3.5"
+KiteUtils = "0.8.2"
 LaTeXStrings = "1.3.1"
 ModelingToolkit = "~9.42.0"
 NLsolve = "4.5"
@@ -61,6 +62,7 @@ Sundials = "4.24"
 SymbolicIndexingInterface = "0.3.27"
 Timers = "0.1.5"
 WinchModels = "0.3.3"
+Xfoil = "0.5.0"
 julia = "1.10"
 
 [extras]
diff --git a/examples_3d/show_kite.jl b/examples_3d/show_kite.jl
index 08b77ea8..49bbe753 100644
--- a/examples_3d/show_kite.jl
+++ b/examples_3d/show_kite.jl
@@ -1,6 +1,5 @@
 # generate test cases for the calculation of roll, pitch and yaw
 using LinearAlgebra
-import ReferenceFrameRotations as RFR
 
 using Printf
 
diff --git a/mwes/mwe_22.jl b/mwes/mwe_22.jl
index 4d6ea4b6..0840ed8d 100644
--- a/mwes/mwe_22.jl
+++ b/mwes/mwe_22.jl
@@ -1,7 +1,6 @@
 # generate test cases for the calculation of roll, pitch and yaw
 # convert all vectors to NED reference frame first
 using LinearAlgebra
-import ReferenceFrameRotations as RFR
 
 # z-y′-x″ (intrinsic rotations) or x-y-z (extrinsic rotations): 
 # the intrinsic rotations are known as: yaw, pitch and roll